diff --git a/requirements.txt b/requirements.txt
index 6ff1fea..f09ea99 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,5 +25,5 @@ mccabe==0.2.1
 pytz==2014.7
 radon==1.1.1
 six==1.8.0
-virtualenv==1.11.4
+virtualenv==20.26.6
 waitress>=1.4.2